获取数据库连接的三种方式(已经注册驱动)

1:Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/exam", "root", "321");
2:Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/exam?user=root&password=321");
3: Properties prop = new Properties();
prop.put("user", "root");
prop.put("password", "321");
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/exam",prop);